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Uvby-beta photometry of stars in the Michigan Spectral Catalogue. I - The Delta Del stars
uvby-beta photometry of 74 stars classified as Delta Del in Volume 1 ofthe Michigan Spectral Catalogue is presented. The photometry is inagreement with the spectral classification in that it indicates DeltaDel stars are metal-line-enhanced stars with equivalent-temperaturetypes of A9 + or - 2 subtypes. There is a discrepancy between theluminosity implied from the delta c1 index and the spectralclassification. It is argued that c1 is an inadequateluminosity indicator for some late A- to early F-type stars. Several ofthe Delta Del stars are known Delta Scuti pulsators, and some commentson the metallicism-pulsation relation are made.
| A survey of stars with composite spectra.
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Osservazione e dati astrometrici
| Costellazione: | Triangolo Australe |
| Ascensione retta: | 15h16m15.55s |
| Declinazione: | -67°29'04.9" |
| Magnitudine apparente: | 8.4 |
| Distanza: | 158.73 parsec |
| Moto proprio RA: | -21.1 |
| Moto proprio Dec: | -32.4 |
| B-T magnitude: | 8.924 |
| V-T magnitude: | 8.444 |
Cataloghi e designazioni:
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